Water proofing compositions for cement mortar or concrete and method employing same

ABSTRACT

Water proofing compositions containing a reclaimed butyl rubber of used inner tube scraps as the active component have a high adhesion to cement mortar or concrete and are used for water proofing materials in buildings and civil engineering works.

This is a continuation, of application Ser. No. 668,114 filed Mar. 18,1976, now abandoned, which is a continuation of Ser. No. 537,014, Dec.27, 1974, now abandoned.

The present invention relates to water proofing compositions, the activecomponent of which is reclaimed butyl rubber of butyl rubber scraps andwhich are utilized for water proofing or stopping materials, jointmaterials and the other materials for buildings and civil engineeringworks.

The compositions of the present invention contain the reclaimed butylrubber as the active component and further defined kinds and amounts ofthermoplastic resins, softening oils, fillers, tackiness adjustingagents, antioxidants, and solvents and are non-crosslinkable andmaintain a tacky state. These compositions are prepared into a liquidform, a fluid form or a plastic form having a desired hardness, adesired consistency or a desired viscosity, and are used alone or inlaminates and the other various forms, for example, solid sheet form,ribbon form, strip form and the like.

It has been found that the compositions have a remarkable function thatthey have a high adhesion to freshly mixed mortar and when freshly mixedcement mortar (wet) housing the composition of the present invention iscured and hardened, the dried and hardened mortar adheres and integrateswith the composition. The compositions can be applied to constructionjoints and expansion joints of concrete or mortar upon making surfacewaterproofing or underground construction and utilized for the sameobject in roads, ports and dams. Furthermore, the compositions can beused for improvement of applying ceramic tiles and improvement ofconstructing walls of wood prefabrication house. In the latter case, thecomposition of the present invention is applied on plywoods and then thethus treated plywoods are provided on the wall portion, after which, acolor cement resin mortar is sprayed thereon.

The particular function of the compositions of the present inventionprovides novel workings which can entirely change the conventionalworking and the compositions can completely prevent the leakage of waterand greatly reduce the working labor cost. Furthermore, the inner tubescraps collected from cars can be effectively utilized and the presentinvention is very useful.

For surface water proofing of cement mortar, the following processeshave been known.

(1) Laminating of bituminous materials, such as asphalt, tar and thelike.

(2) Applying of a mixed resin of Portland cement and a polymer emulsion.

(3) Coating of one or two liquids of polymer solutions of neoprene,Hypalon (chlorosulfonated polyethylene) and polyurethane.

(4) Sticking of sheet roofing of vulcanized synthetic high molecularweight substances, such as butyl rubber, neoprene, Hypalon, EPT and thelike.

However, these processes have some drawbacks in the performance, cost,workability and the like.

That is, the above described process (1) is the main process but the tarmust be melted by firing and the laminating must be effected in severallayers, so that the labor cost is higher.

In the above described process (2), the applied resin is poor in theadhesion to the old mortar and cracks are caused owing to the expansionand shrinkage of mortar.

In the above described process (3), the skin is thin, so that pinholesare liable to be formed upon the working and the coating is nonuniformand in the chemical reaction type of two liquids, the temperature uponthe working greatly influences and a severe control upon working isrequired.

In the above described process (4), the polarity of the vulcanizedrubber sheet roofing is low and the adhering of the mutual sheets isdifficult, so that the bonding and integrating of lap portions of thesheets are difficult and further the sheets cannot adapt expansion andshrinkage due to the temperature difference of the concrete structuresand the drying and hardening of cement mortar after the working and theadhesion breakage is caused from the lap portion and the water leakageis apt to be caused.

In the general water proofing working, except for the exposed waterproofing where a load is not relatively applied, a protective layercomposed of Portland cement compound, such as mortar is provided on thewater proofing layer in order to endure the walking and the other loadbut any water proofing layer does not adhere and integrate with thePortland cement compound, such as mortar and therefore the protectivelayer having a thickness of more than 30 mm must be applied and theweight of the building becomes larger. In addition, cracks are causeddue to the drying shrinkage of the mortar.

In the exposed water proofing, a protective coating is generallyapplied. When the walking load is not great, the cement mortarprotective layer to be applied on the waterproofing layer may be thinbut an "inflation phenomenon" is readily caused in the polymer sheetroofings due to temperature variation of sunshine, so that the adhesionbetween mutual sheet roofings or between said roofing and the baseconcrete is improtant.

The vulcanized polymer sheet roofing or the water proofing process bymeans of a polymer coating, which has been heretofore used for theexpose water proofing, is expensive, so that the thickness of saidroofing or coating is about 0.1 mm and thin.

As the conventional expansion joints of concrete structures, even if awater stopping material, such as vulcanized rubber of polyvinyl chloride(PVC) is inserted into a freshly mixed mortar (wet), said water stoppingmaterial does not adhere and integrate with the freshly mixed mortar(wet) when said mortar is dried and hardened. Accordingly, the expansionjoints having the satisfactory properties have neven been obtained.Thus, the previously hardened cement mortar is cut by a concrete cutteror a joint plate is previously inserted into the cement mortar and aftersaid cement mortar is hardened, the joint plate is pulled out and theninto the resulting gap is injected a heated bituminous compound or twoliquid caulking material of polyurethane-Thiokol and the like as anelastic sealant to provide a cushionable portion for the expansion andshrinkage of the concrete or mortar. In this case, in order tosupplement the adhesion, a liquid or fluid polymer caulking material maybe used together. Alternatively, a molded water stopping material (forexample, vulcanized rubber, PVC) or a sponge-shaped molding is used butin any case, the adhesion of said molding to the mortar is poor and isnot satisfied. Accordingly, said molding cannot adapt to the expansionand shrinkage of the concrete and therefore where the water pressure isapplied at an underground, the water leakage cannot be avoided and asecondary repair is always carried out.

The object of the present invention to is provide the compositions whichcan obviate these drawbacks of the surface water proofing and the jointworking and the active component of the compositions is the reclaimedbutyl rubber produced from the used butyl rubber inner tube scraps andthe compositions have a high adhesion to cement mortar.

The present invention includes the following four compositions, whichare homogeneous mixtures of the defined amount of reclaimed butylrubber, an inorganic filler, an antioxidant, a softening agent, asynthetic rubber, a thermoplastic synthetic resin and/or isobutylene lowpolymer, a solvent and the like and have given ranges of hardness (JIShardness tester), consistency (JIS K-2530 penetrometer) and viscosity,which are suitable for respective use and application.

COMPOSITION A

This is a homogeneous mixture of 65-40% by weight of reclaimed butylrubber of butyl rubber scrap, 30-50% by weight of an inorganic filler, asynthetic rubber, an antioxidant, and a softener and has a hardness of30-70 (JIS hardness tester).

COMPOSITION B

This is a homogeneous mixture of 35-15% by weight of reclaimed butylrubber of butyl rubber scrap, 40-50% by weight of an inorganic filler,20-35% by weight of a thermoplastic synthetic resin and/or lowpolymerized isobutylene and a softener and has a consistency (JIS K-2530penetrometer) at 25° C. of 50-100.

COMPOSITION C

This is a homogeneous mixture of 5-14% by weight of reclaimed butylrubber of butyl rubber scrap, 50-60% by weight of an inorganic filler,15-20% by weight of a thermoplastic synthetic resin and/or lowpolymerized isobutylene, 10-20% by weight of a solvent and a softenerand has a consistency (JIS K-2530 penetrometer) at 25° C. of 200-400.

COMPOSITION D

This is a homogeneous mixture of 10-20% by weight of reclaimed butylrubber of butyl rubber scrap, 5-15% by weight of an inorganic filler,1-15% by weight of a thermoplastic synthetic resin and a solvent and hasa viscosity (Brookfield viscometer cps) at 25° C. of 100-2,000.

The constitution and merits of the compositions of the present inventionwill be explained in the hereinafter mentioned description.

The compositions A-D of the present invention have the following states.

COMPOSITION A

This composition is rolled by rollers into a sheet form and has aself-tackiness.

COMPOSITION B

This composition is molded by an extruder into a sheet form or desiredshapes and has a high tackiness.

COMPOSITION C

This composition is used for a caulking material and has a fluidity.

COMPOSITION D

This composition can be used as a primer and has a property ofpressure-sensitive adhesive.

As seen from the above description, the composition A is a solid sheetform and has tackiness and minimum softness, while the composition D hasthe maximum limit of liquid state.

The compositions A, B, C and D have the properties as shown in thefollowing Table 1.

                  Table 1                                                         ______________________________________                                        Composi-                                                                      tion                                                                          Properties A        B        C       D                                        ______________________________________                                        Hardness                                                                      (JIS hardness                                                                            30-70                                                               tester)                                                                      Consistency                                                                   (JIS K-2530         50-100   200-400                                          Penetrometer                                                                   at 25° C)                                                             Viscosity cps                                                                  at 25° C.                                                             Brookfield                           100-2,000                                 viscometer                                                                   ______________________________________                                    

COMPOSITION A

In Instron tension tester:

Tensile strength: 5-20 Kg/cm²

Tear strength: 5-15 Kg/cm²

Elongation: 300-800%

Adhesion to mortar: 2,000-4,000 g/cm²

COMPOSITION B

Adhesion to cement mortar:

Maximum stress (g), 300-3,000,

Compression strength (g), 500-4,000.

COMPOSITION D

Sample: A sheet of composition A is adhered to a dried hardened cementmortar with this composition.

Peeling test at 180°: 2,000-4,000 g/in (Instron type tester)

The test of adhesion of the compositions A and B to cement mortar waseffected as follows.

In the composition A, a standard mortar prepared by following to JISR5210 was applied on a test piece of the composition A in a thickness of30 mm and 20 mm and the resulting assembly was cured in a chamber havinga temperature of 20° C. and a relative humidity of 80% for 7 days andthe hardened mortar was cut in a dimension of 50 mm (width)×100 mm(length) until reaching the composition A layer. A steel attachment of50 mm×100 mm was bonded thereto with an epoxy resin adhesive and thenthe thus treated test piece was left to stand and cured in a chambermaintained at 25° C. for 24 hours. Then an adhesive force was determinedby peeling the test piece perpendicularly to the adhered surface. Thetensile test was carried out by means of the simple tensile tester ofthe Building Laboratory in the Ministry of Construction, Japan.

In the composition B, the standard mortar prepared following to JISR5210 was applied on both sides of a sample piece of the composition Bhaving a thickness of 10 mm and an area of 35 mm×55 mm and the resultingassembly was cured in a chamber having a temperature of 20° C. and arelative humidity of 80% for 7 days and then the hardened mortar wastested by the Instron tension tester.

In these tests, when gypsum was used instead of the mortar, the sameresults were obtained. While, when the same test was made with respectto a vulcanized rubber sheet or a polyvinyl chloride sheet, these sheetsdid not adhere to the mortar.

As shown in the above Table 1, the compositions A-D have the requiredproperties.

The following Table 2 shows the constitution ranges of typicalembodiments of the compositions A-D by the weight parts and the numeralvalues in the parenthesis shown % by weight.

                                      Table 2                                     __________________________________________________________________________             Component     A         B         C         D                        __________________________________________________________________________    Main     Reclaimed     100       100       100       100                      polymer  butyl rubber  (61-42)   (34-18)   (11-7)    (18-12)                           Processing polymer                                                                           5-20                                                                         (3-9)                                                  Filler   Calcium carbonate   50-100   100-200   300-400   10-30                        Aluminum hydrosilicate                                                                            5-10               10-20                                  Zinc oxide     55-110   130-280   530-780   35-90                                                                               5-10                        Asbestos      (34-46)   (44-49)   (57-53)    (6-11)                           Hard clay                    30-80                                            Talc                                   20-60                                  Blown asphalt                                    20-50                        (Bitumene)                                                           Tackiness                                                                              Thermoplastic resin      60-180                                                                            10-50                                                                              150-280                                                                            100-200                                                                             20-100                                                                             20-100             promoter Saturated low molecu-   (20-31)   (16-19)    (4-13)                           lar weight polymer            50-130   50-80                         Softener Aromatic oil       1- 5                                                       Aliphatic oil 1-5        3-10                                                                               3-10                                                                              20-50                                                                              20-50                         Antioxidant                                                                            Wax           0.5-1.5                                                                            0.5-1.5                                           Solvent  n-Hexane                                    405-510                                                                            200-250                      Gasoline                                         200-250                      Methanol                          130-250         5-10                        Naphtha                           (14-17)                                                                            30-50                                  Toluene                                100-200                       Total                  161.5-237 293-570   930-1.460 560-800                  __________________________________________________________________________

As shown in the above Table 2, the compositions A-D are constituted ofthe accessary components and amounts in order to attain the requiredproperties. An explanation will be made with respect to the componentsto constitute the compositions.

The active component is the reclaimed butyl rubber and in thecomposition A, it is preferable that a processing polymer, such asethylene propylene terpolymer or polybutadiene rubber, is used togetherwith the reclaimed butyl rubber in order that the composition A iseasily separated from rollers when said composition is rolled by rollersand that the weather resistance is improved.

In all the compositions A-D, the reclaimed butyl rubber gives thetackiness. The viscosity of the reclaimed butyl rubber composing thecompositions A and B has a value of 60±5 ML/212° F./4 minutes (largerotor of mooney viscomotor), and the viscosity of the reclaimed butylrubber composing the compositions C and D has a value of 40±5.

The filler includes various substances and is selected considering thehandling of the resulting composition and the economy. For example,aluminum hydrosilicate and hard clay are high in the oil absorbingproperty and increase the hardness and reduce the tackiness, so thatthese substances cannot be used in a large amount, but they arepreferable in order to maintain the form and to obtain a certainspecific gravity.

The tackiness promoter includes thermoplastic resins and saturated lowmolecular weight polymers. The thermoplastic resins are ones derivedfrom petroleum, such as terpene polymerized resin, hydrogenated resin,cumarone resin, xylene resin and the like. Among them, terpenepolymerized resin and hydrogenated resin are preferable. The saturatedlow molecular weight polymers are, for example, polyisobutylene having amolecular weight of 5-300.

The above described tackiness promoters have a high compatibility withthe reclaimed butyl rubber and an important role for the compositions B,C and D, but an excess amount should not be used, because theagglomeration of the compositions is greatly reduced.

The softener makes the dispersion of the filler and the like at theoriginal stage of preparing the compositions easy and therefore is usedfor controlling the softness of the compositions but the aromatic oilsare superior in the effect to the aliphatic oils. In general the amountof the softener used should be the lower limit.

The antioxidant is contained when the composition of the presentinvention is particularly used for the exposed water proofing workings.

In the solvent, the aromatic solvents are higher in the compatibility asin the softener. The composition C is injected by a caulking gun and itis taken into account that the "volume reduction" of the coated film ispossibly small. The use together of a small amount of a non-solvent ofalcohol lowers the absolute viscosity and contributes to improvement ofthe workability and performance.

Since the compositions of the present invention have tackiness and havenot been vulcanized, they are sensitive to temperature. The constitutionof each of the compositions is selected depending upon the temperatureupon working, the desire of users, the application and the like.

An explanation will be made with respect to the reason of the definitionof the amount of the components in the compositions A-D.

COMPOSITION A

When the amount of the reclaimed butyl rubber of this compositionexceeds 65% by weight, the tackiness increases but the hardness lowers,while when said amount is less than 40% by weight, the hardness is toolarge and the tackiness lowers. When the amount of the filler exceeds50% by weight, the hardness is too large, while when said amount is lessthan 30% by weight, the desired hardness is not obtained.

COMPOSITION B

When the amount of the reclaimed butyl rubber exceeds 35% by weight, thetackiness increases but the defined consistency cannot be obtained,while when said amount of less than 15% by weight, the definedconsistency also cannot be obtained. Furthermore, when the amount of theinorganic filler exceeds 50% by weight, the hardness is too large andthe consistency also is too large, while when said amount is less than40% by weight, the desired consistency cannot be obtained. Furthermore,when the amount of the thermoplastic synthetic resin and/or the lowmolecular weight polymer of isobutylene exceeds 35% by weight, theagglomeration of the composition lowers and the defined consistencycannot be obtained, while when said amount is less than 20% by weight,the defined consistency also cannot be obtained.

COMPOSITION C

When the amount of the reclaimed butyl rubber exceeds 14% by weight, thetackiness increases but the defined consistency cannot be obtained,while when said amount is less than 5% by weight, the definedconsistency also cannot be obtained. When the amount of the fillerexceeds 60% by weight, the hardness is too large and the definedconsistency is not obtained, while when said amount is less than 50% byweight, the defined consistency also cannot be obtained. Furthermore,when the amount of the thermoplastic synthetic resin and/or the lowmolecular weight polymer of isobutylene exceeds 20% by weight, theagglomeration of the composition lowers and further the definedconsistency cannot be obtained, while when said amount is less than 15%by weight, the defined consistency cannot be obtained. When the amountof the solvent exceeds 20% by weight and said amount is less than 10% byweight, the defined consistency cannot be obtained.

COMPOSITION D

When the amount of the reclaimed butyl rubber exceeds 20% by weight, thetackiness increases but the defined viscosity cannot be obtained, whilewhen said amount is less than 10% by weight, the defined viscosity alsocannot be obtained. When the amount of the filler exceeds 15% by weight,the viscosity increases and is not within the defined range, while whensaid amount is less than 5% by weight, the viscosity lowers and is notwithin the defined range. Furthermore, when the amount of thethermoplastic synthetic resin and/or the low molecular weight polymer ofisobutylene exceeds 15% by weight, the agglomeration of the compositionlowers and the viscosity increases and is not within the defined range,while when said amount is less than 1% by weight, the viscosity is notwithin the defined range.

The compositions A-D of the present invention can be used for variousapplications, for example, water proofing sheets, water stopping jointmaterials, caulking materials, constitution materials for the outerportion (wall, etc.) of buildings and the like and about twentyapplications may be developed. The embodiments of these applications arelisted hereinafter.

The compositions A-D correspond to those disclosed in Tables 1 and 2.The compositions A-D can be used alone or in combination and furtherthese compositions may be used in combination with other materials asexplained hereinafter.

                  Table 3                                                         ______________________________________                                        Pro-                                                                          duct                                                                          No.  Construction      Remarks                                                ______________________________________                                        Non-vulcanized high polymer roofings                                           1   A alone     Water proofing sheet of 1.0-3.0mm × more                                than 1,000cm. These sheets are adhered                                        on the concrete to be water-proofed with                                      an adhesive.                                                  2   A + D       On the composition A sheet is applied                                         the composition D as an adhesive. The                                         form is similar to the product No. 1.                         3   A + B       A laminate of the composition A sheet                                         (thickness of more than 1.0mm) and the                                        composition B sheet (1.0-1.5mm × more                                   than 1,000cm).                                                                Applying on the concrete having a large                                       movement.                                                     4   B alone     Sheet of more than 1.0mm(thickness)                                           × more than 1,000cm (breadth).                                          Applying to the places where the                                              influence of sun shine is little or                                           walking is not made.                                         Composite high polymer roofings                                                5   Vulcanized  The form is similar to the product                                polymer     No. 2. A vulcanized polymer sheet roof-                           sheet       ing is laminated on the product No. 2.                            roofing+A+D The surface layer is the vulcanized                                           polymer sheet roofing and hard, so that                                       walking can be made on this roofing.                          6   Vulcanized  The form is similar to the product                                polymer     No. 5. This product is used when the                              sheet       adhesion to the concrete to be treated                            roofing+B   is required and the concrete is movable.                      7   Polymer     A hardenable resin, such as polyurethane                          coating     is coated on the composition A sheet.                             roofing+A                                                                 8   Porous      The form is similar to the product                                material    No. 2. The porous material is poly-                               A+D         ethylene foam, polyurethane foam,                                             asbestos, glass fiber. Heat insulating                                        roofing.                                                      9   Porous      This product is similar to the product                            material+B  No. 8. Heat insulating roofing.                              10   Fibrous     The form is similar to the product                                material+B  No. 4. A laminate of the composition B                                        sheet with asphalt felt or jute felt.                        Molded or injecting sealing materials                                         11   B alone     The form is similar to the product                                            No. 4. Ribbon, strip and the other                                            shaped extruded products. This product                                        is inserted in a freshly mixed mortar                                         (wet) or is used as a joint for ALC, RC                                       and the like.                                                12   Various     The form is similar to the product                                aggregates+B                                                                              No. 11. This product is used in                                               combination with metal, plastic, rubber                                       plate or foam in view of workability                                          or structure plan.                                           13   B+C         The form is similar to the product                                            No. 11. This product is used for old                                          joint portions other than insertion of                                        freshly mixed mortar (wet).                                  14   Various     The form and using process are similar                            aggregates  to the product No. 13. The breadth of                             +B+C        joint is uneven, so that it is prefer-                                        able to use together with a fluid                                             injecting caulking material.                                 15   B+the other The form is similar to the product                                polymer     No. 11. The other caulking materials                              caulking    are, for example, polyurethane, epoxy,                            materials   Thiokol resin, asphalt.                                      16   Various     The form is similar to the product                                aggregates  No. 12. The using process is similar                              +B+the other                                                                              to that of the product No. 15.                                    polymer                                                                       caulking                                                                      materials                                                                17   C alone     This product is used as an injection                                          caulking.                                                    Material for constituting outer portions of buildings                         18   Materials   A unique development in use. On both                              for con-    sides of the composition A sheet are                              stituting   applied the composition D and on the one                          outer por-  side is bonded ceramic tiles, face                                tions of    papers of face plates. The resulting                              buildings   assembly is placed opposing to the                                +A or B     hardened mortar cement on the wall to                                         be provided with said ceramic tiles,                                          face papers or face plates, by a                                              supporting frame and freshly mixed                                            mortar (wet) is charged between the                                           space of said assembly and the hardened                                       mortar wall and cured.                                       19   Plywood+D or                                                                              This product is used for wood pre-                                B or C      fabrication houses. For example, on one                                       side of a plywood is applied the compo-                                       sition D, B or C and the resulting                                            assembly is provided on a wall of a                                           house and then a cement mortar or a                                           synthetic resin mortar is sprayed                                             thereon. Then, the applied composition                                        D, B or C side can be bonded to said                                          mortar simply. The labors, workings                                           for applying asphalt paper and metal                                          lath can be omitted.                                         Adhesive                                                                      20   D alone     This product is used as a pressure-                                           sensitive adhesive or a primer.                              ______________________________________                                    

As seen from the above Table 3, the compositions A-D of the presentinvention have very broad applications. The product Nos. 1-4, No. 11,No. 13, No. 17 and No. 20 show the use of the compositions A-D, alone orin combination.

In any case, the high adhesion of the reclaimed butyl rubber to thecement mortar is utilized. Particularly, the product Nos. 18 and 19 areunique applications of the compositions of the present invention and thelabor for making building structures can be greatly omitted.

A further explanation will be made with respect to the examples of theabove described compositions A-D in more detail. In these examples, thenumeral values of the recipe show "part by weight" and the numeralvalues in the parenthesis show "% by weight".

EXAMPLES OF THE COMPOSITION A

                  Table 4                                                         ______________________________________                                                        Example                                                                              Example  Example                                                       1-1    1-2      1-3                                           ______________________________________                                        Reclaimed butyl rubber                                                                          100      100      100                                        (Made by Hayakawa                                                                              (60.3)   (51.5)   (43.3)                                     Rubber Co.)                                                                  Butyl rubber JSR 035                                                                            10       --       --                                         (Made by Nippon Butyl Co.)                                                                     (6)                                                         EPDM Mitsui EPT #1045                                                                           5        10       15                                         (Made by Mitsui Petroleum                                                                      (3)      (5)      (6.5)                                      Chemical Co.)                                                                Calcium carbonate 50       75       100                                                         (30.1)   (39)     (43.3)                                    Aluminum hydrosilicate                                                                          --       5        10                                                                   (2.5)    (4.3)                                     Antioxidant Suntite S                                                                           1.0      1.0      1.0                                        (Made by Seiko Chemical Co.)                                                                   (0.6)    (0.5)    (0.4)                                     Process oil AH-10 --       3.0      5.0                                        (Heavy aromatic process oil)                                                                            (1.5)    (2.2)                                     Total             166      194      231                                                         (100)    (100)    (100)                                     Physical properties                                                           Tensile strength TSB                                                           (Instron tension tester)                                                      (Kg/cm.sup.2)    5.0      10       15                                        Elongation ELB                                                                 (Instrom tension tester)                                                      (%)              750      500      350                                       Tear resistance                                                                (Instron tension tester)                                                       (Kg/cm)         4.5      8.3      13.3                                      Hardness H (JIS)  35       50       65                                        Adhesion to mortar (Kg/cm.sup.2)                                                                 2,010    3,200    3,100                                    ______________________________________                                    

Any of the compositions in these examples were excellent in the adhesionto cement mortar and the water proofing property and the remarkableeffect of the present invention was recognized.

EXAMPLES OF THE COMPSOTION B

                  Table 5                                                         ______________________________________                                                        Example                                                                              Example  Example                                                       2-1    2-2      2-3                                           ______________________________________                                        Reclaimed butyl rubber                                                                          100      100      100                                       (Made by Hayakawa (33)     (22.6)   (17.5)                                    Rubber Co.)                                                                   Calcium carbonate 100      150      200                                                         (33)     (33.9)   (35.1)                                    Terpene polymerized resin                                                                       20       35       50                                        YS-PX-1150        (6.5)    (8)      (8.8)                                     (Made by Yasuhara Fat Oil Co.)                                                Light process oil 3        7        10                                        Diana Process KL-1                                                                              (1.0)    (1.6)    (1.8)                                     (Made by Idemitsu Kosan Co.)                                                  Clay              30       50       80                                                          (10.0)   (11.3)   (14.0)                                    Low polymeric polyisobutylene                                                                   50       100      130                                       Polybutene HV-3000                                                                              (16.5)   (22.6)   (22.8)                                    (Made by Nippon Petroleum                                                     Chemical Co.)                                                                 Total             303      442      570                                                         (100)    (100)    (100)                                     Physical properties                                                           Consistency (JIS K2530)                                                                         55       100      80                                        Adhesion                                                                      (Instron tension tester)                                                       (g/cm.sup.2)      1,650    1,010   300                                       Compression strength                                                          (Instron tension tester)                                                       (g/cm.sup.2)      2,000    1,450   550                                       ______________________________________                                    

Any of the compositions in these examples were excellent in the adhesionto cement mortar and the water proofing property and the remarkableeffect of the present invention was recognized.

EXAMPLES OF THE COMPOSITION C

                  Table 6                                                         ______________________________________                                                        Example                                                                              Example  Example                                                       3-1    3-2      3-3                                           ______________________________________                                        Reclaimed butyl rubber                                                                          100      100      100                                       (Made by Hayakawa (10.7)   (8.4)    (6.8)                                     Rubber Co.)                                                                   Calcium carbonate 300      350      400                                                         (32.3)   (29.4)   (27.4)                                    Talc              20       40       60                                                          (2.2)    (3.4)    (4.2)                                     Process oil       20       30       50                                        Diana Process KL-1                                                                              (2.2)    (2.5)    (3.4)                                     (Made by Idemitsu Kosan Co.)                                                  Low polymeric polyisobutylene                                                                   50       65       80                                        Polybutene HV-3000                                                                              (5.4)    (5.4)    (5.5)                                     (Made by Nippon Petroleum                                                     Chemical Co.)                                                                 Asbestos          200      250      300                                                         (21.5)   (21.0)   (20.5)                                    Aluminum hydrosilicate                                                                          10       15       20                                                          (1.1)    (1.3)    (1.4)                                     Terpene polymerized resin                                                                       100      150      200                                       YS-PX-1150        (10.7)   (12.6)   (13.7)                                    (Made by Yasuhara Fat Oil Co.)                                                Toluene           100      150      200                                                         (10.7)   (12.6)   (13.7)                                    Naphtha           30       40       50                                                          (3.2)    (3.4)    (3.4)                                     Total             930       1,190    1,460                                                      (100)    (100)    (100)                                     Physical properties                                                           Consistency (JIS K2530)                                                                         380      350      210                                       Slump m/m         2.0      1.0      0                                         Adhesion          OK       OK       OK                                        ______________________________________                                    

Any of the compositions in these examples were excellent in the adhesionto cement mortar and the water proofing property and the remarkableeffect of the present invention was recognized.

EXAMPLES OF THE COMPOSITION D

                  Table 7                                                         ______________________________________                                                        Example                                                                              Example  Example                                                       4-1    4-2      4-3                                           ______________________________________                                        Reclaimed butyl rubber                                                                          100      100      100                                        (Made by Hayakawa                                                                              (17.5)   (15.9)   (12.5)                                     Rubber Co.)                                                                  Zinc oxide        5        10       10                                                          (0.9)    (1.6)    (1.3)                                     Calcium carbonate 10       20       30                                                          (1.8)    (3.2)    (3.8)                                     Terpene polymerized resin                                                                       30       50       80                                        YS-PX-1150        (5.3)    (7.9)    (10)                                       (Made by Yasuhara Fat                                                         Oil Co.)                                                                     Low polymeric polyisobutylene                                                                   --       10       20                                        Polybutene HV-3000         (1.6)    (2.5)                                      (Made by Nippon Petroleum                                                     Oil Co.)                                                                     Asphalt (Bitumene)                                                                              20       35       50                                                          (3.5)    (5.6)    (6.2)                                     n-Hexane          200      200      250                                                         (35.1)   (31.7)   (31.2)                                    Gasoline          200      200      250                                                         (35.1)   (31.7)   (31.2)                                    Methanol          5        5        10                                                          (0.9     (0.8)    (1.3)                                     Total             570      630      800                                                         (100)    (100)    (100)                                     Physical properties                                                           Viscosity cps 20° C.                                                                     800       1,200   100                                        (Brookfield viscometer)                                                      Non-volatile matter %                                                                           29       36       36                                        Adhesion g/in      2,500    3,500    3,000                                     (Instron tension tester)                                                     ______________________________________                                    

The shrinkage caused when the concrete buildings or engineeringconstructions is dried and hardened, is always more than 10⁻⁴ and cracksare caused when any restriction is subjected thereto. For obviating thisdrawback, a variety of means have been adopted and the compositions ofthe present invention are very useful and economic for solving thisdrawback.

All the compositions of the present invention have weather resistanceand tackiness and readily bond to concrete and further bond to the othermaterials, for example, polyethylene foam, vulcanized rubber roofingsand the like.

The most important merit of the present invention is that thecompositions adhere and integrate with the freshly mixed mortar (wet)and this merit has developed various applications. Furthermore, theprotective mortar layer in the waterproofing workings can be made lightweight and a great merit is provided to building plan. Furthermore, whenthe composition sheet of the present invention is applied on theconcrete, said sheet adapts and endures expansion and shrinkage of theconcrete and any of the conventional waterproofing sheets do not havesuch merit.

As the active component of the compositions of the present invention, arubber which is obtained in the course of the regeneration of butylrubber scraps can be used other than the reclaimed butyl rubber.

The compositions of the present invention can adhere and integrate withgypsum other than cement mortar or concrete, so that the compositionscan be used for the gypsum workings.

What is claimed is:
 1. A method of water-proofing hardened cement mortaror concrete comprising the steps of making a homogeneous mixtureconsisting essentially of 65-40% by weight reclaimed butyl rubber,30-50% by weight filler, a softener and an antioxidant; rolling saidmixture into a sheet having a hardness of 30-70, applying an adhesive onthe hardened cement mortar or concrete, placing said sheet on theapplied adhesive to adhere said sheet to said hardened cement mortar orconcrete to form a water proofing roofing and applying wet mortar orconcrete on said sheet to adhere said wet mortar or concrete to saidsheet.
 2. A method of water-proofing cement mortar and concrete asclaimed in claim 1, wherein said adhesive is a bonding material having aviscosity (Brookfield viscometer) at 25° C. of 100-2,000 cps, whichcomprises 10-20% by weight of reclaimed butyl rubber, 5-15% by weight ofa filler, 1-15% by weight of at least one of a thermoplastic syntheticresin and a low molecular weight polymer of isobutylene and a solvent.3. A water-proofing roofing sheet to be used in contact with wet cementmortar or wet concrete and having adhesion to the wet cement mortar orwet concrete without employing additional bonding materials and having ahardness of 30-70 (JIS hardness tester), which essentially consists of65-40% by weight of reclaimed butyl rubber, 30-50% by weight of afiller, a softener and an antioxidant.